According to an unconfirmed report from TechCrunch Europe, Nokia was interested in a possible partnership with RIM before announcing their decision to partner Windows Phone 7. The guys from BGR report:

It had been widely reported that Nokia was deciding between Google’s Android platform and Microsoft’s Windows Phone 7 OS when considering its future, but RIM’s BlackBerry platform was apparently also in the running to become Nokia’s potential savior. Citing “well-placed sources,” the blog claims that RIM wasn’t interested in a partnership and so the decision came down to two options.